Mountains and Stars

When the land was entirely flat, long ago, two clans contested for the rulership. They were the mountains and the stars, the first things that were. Their battles cannot be imagined today, but the result of them can still be seen. The blood shed then became the oceans, the mountains grew mighty, and the stars succumbed to defeat and eternal exile.
From time to time a star tests the fortitude of the mountains and finds it formidable still. Your Exile Sword is made from a brave star's corpse. It has the strength of bravery, but it can never win against a Sovereign Sword made from mountain's metal. Seek the Erosion Sword, hero, but do not be surprised if it is your own life that is worn away.
Finis

The Best Materials

Forget dumb old blandamantium and get up to date with double bronze, double iron, and double steel. Owing to the square cubed law, double iron is eight times as good as regular iron. Since bronze is an alloy, it ends up being twenty-four times as good in double form.